As for the employees; they should be held accountable in some meaningful fashion; but doubt they will.
(Remember the 'Security Guards' who watched a similar event at train station; where girl was unable to defend herself against a gang attack. (Despite her pleas; Security did nothing; and were not held accountable; even though they wore uniforms and badges; which at least implied, that they should.)
Yes, many of those in attendance are guilty of callous disregard for the dignity of life (as are some on this thread, from the comments). At least they fired the lowlife employee that took the video (who coached the girls to leave before the cops arrived). Of course he'll just go get another 8 dollar an hour job somewhere else.
As for the when/where/time that would include the entire city of Baltimore. There's really noplace safe there, for either black or white people.